Auto-repairing compositions for overcoat layer, method of producing the same, and display apparatus

ABSTRACT

Disclosed are an auto-repairing composition for overcoat layer, a method of producing the same, and a display apparatus. The composition for overcoat layer comprising 1-10 wt % of microcapsules based on the total weight of the composition for overcoat layer, said microcapsule including a capsule wall and a capsule core, wherein the capsule wall comprises an alkali-insoluble resin, and the capsule core comprises, based on the total weight of the capsule core, 30-60 wt % of a photo-curable unsaturated oligomer, 30-60 wt % of a photo-polymerizable monomer, 1-10 wt % of a photo-initiator, and 0-5 wt % of additive.

TECHNICAL FIELD

Embodiments of the present invention relate to an auto-repairingcomposition for overcoat layer, a method of producing the same, and adisplay apparatus.

BACKGROUND

In flat panel displays (FPDs), Thin Film Transistor Liquid CrystalDisplay (briefly, TFT-LCD) are characterized in small volumes, low powerconsumption, relatively low production cost, and non-radiations, andthus predominates in the current FPD market.

Currently, the primary structure of TFT-LCD comprises an array substrateand a color filter substrate (CF) assembled together. Among others, thecolor filter substrate comprises primarily a glass substrate, a BlackMatrix (briefly, BM), a color photoresist, and an Overcoat (briefly, OC)layer. In general, BM is arranged between the color patterns formed fromthe color photoresist in pattern of grids, stripes, or patches, andserves primarily to improve the frame contrast by inhibiting the mixingof various colors. BM can also block scattered light so as to preventTFT abnormal operation caused by inter-pixel light leakage. The colorphotoresist comprises red (R), green (G), and blue (B) color layers. Forensuring color uniformity of the color filter substrate and preventinglight leakage, there are overlapping regions having a certain widthbetween the R, G, B color photoresists and BMs, and such width isgenerally more than 3 microns. Moreover, the heights of the R, G, Bcolor photoresists within the overlapping regions are relatively higherthan other regions, thereby generating a relatively large heightdifference. For eliminating such height difference, it is required toapply an layer of OC material to the surface of the R, G, B photoresistto ensure the surface flatness of CF, thereby ensuring the uniformity ofrubbing of alignment layer and achieving a high-quality frame. Moreover,the OC layer can also serve as a protective layer to preventmicro-molecule species in the color layer from migrating into andcontaminating the liquid crystal layer to cause an unevenness of color.Thus, the flatness and completeness of the surface of the OC layer isessential to improving the quality of the TFT-LCD products. For avoidingthe defect of OC layer, the prior art process needs a repair procedureafter the formation of the OC layer. Such procedure can repair the OClayer via finishing repair. However, there is not yet effective repairmeans for addressing the defects caused by the damage of OC layer.

SUMMARY

To address the aforesaid problems, embodiments of the present inventionprovides an auto-repairing composition for overcoat layer, which canauto-repair the damage of the overcoat layer under light radiation,thereby improving substantially the pass ratio of products.

An embodiment of the present invention provides an auto-repairingcomposition for overcoat layer comprising 1-5 wt % of microcapsulesbased on the total weight of the composition for overcoat layer, saidmicrocapsules having a capsule wall and a capsule core, wherein thecapsule wall comprises an alkali-insoluble resin, and the capsule corecomprises, based on the weight of the capsule core:

-   -   30-60 wt % of photo-curable unsaturated oligomer;    -   30-60 wt % of photo-polymerizable monomer;    -   1-10 wt % of a photo initiator; and    -   0-5 wt % of an additive.

In an aspect, the composition for overcoat layer further comprises,based on the total weight of the composition for overcoat layer:

-   -   1-20 wt % of epoxy group-containing acrylate resin;    -   1-20 wt % of curing agent;    -   70.5-83.5 wt % of organic solvent; and    -   0.01-2 wt % of an adjuvant.

Another embodiment of the present invention provides a method ofproducing the composition for overcoat layer comprising:

-   -   mixing and dispersing 30-60 wt % of photo-curable unsaturated        oligomer, 30-60 wt % of photo-polymerizable monomer, 1-10 wt %        of photoinitiator and 0-5 wt % of additive based on the total        weight of the capsule core to produce a composition for capsule        core;    -   adding the composition for capsule core dropwise into a resinous        material for forming the capsule wall and stirring to faint a        suspension of microcapsules;    -   filtering the suspension of microcapsules, screening, drying,        and curing to produce microcapsules; and    -   mixing 1-5 wt % of microcapsules based on the total weight of        the composition for overcoat layer with other components of the        composition for overcoat layer to form the composition for        overcoat layer.

Still another embodiment of the present invention provides a displayapparatus comprising a color filter substrate, wherein the compositionfor overcoat layer in accordance with the embodiments of the presentinvention or produced in accordance with the method of the embodimentsof the present invention is used to form an overcoat layer of the colorfilter substrate.

DETAILED DESCRIPTION

To address the problem of product defects caused unrepaired damages ofan OC layer, an embodiment of the present invention provides acomposition for overcoat layer comprising microcapsules having a capsulewall and a capsule core. When damages appear in the OC layer formed fromthe composition, the capsule wall cracks under the damage shear force sothat the materials of capsule core flow out. The photo-curableunsaturated oligomer, photo-polymerizable monomer and photoinitiatorcontained in the capsule core cure under light radiation, repairing thedamage and maintaining the completeness and flatness, and therebyimproving the pass ratio of products. Due to the incorporation ofmicrocapsules into the composition for overcoat layer, the subsequentprocedure of repairing the OC layer can be omitted, thereby saving theproduction and improving the productivity.

Hereinafter the present invention is further illustrated in details withreference to the examples.

An embodiment of the present invention provides a composition forovercoat layer comprising 1-10 wt % of microcapsules based on the totalweight of the composition for overcoat layer, said microcapsules havinga capsule wall and a capsule core, wherein the capsule wall comprises analkali-insoluble resin, and the capsule core comprises, based on theweight of the capsule core,

-   -   30-60 wt % of photo-curable unsaturated oligomer;    -   30-60 wt % of photo-polymerizable monomer;    -   1-10 wt % of a photoinitiator; and    -   0-5 wt % of an additive.

In an aspect, the photo-curable unsaturated oligomer can comprise one ormore selected from the group consisting of epoxy acrylic resin,polyester acrylic resin, and polyurethane acrylate. Thephoto-polymerizable monomer can comprise one or more selected from thegroup consisting of dipentaerythritol hexacrylate (DPHA),trimethylolpropane triacrylate (TMPTA), pentaerythritol tetracrylate(PETA), and dipentaerythritol pentacrylate (DPPA). The photoinitiatorcan comprise one or more selected from the group consisting ofbenzoin-based compounds, such as, benzoin, benzoin dimethylether;benzil-based compounds, such as, deoxybenzoin; alkylphenone-basedcompounds, such as, α-hydroxyalkylphenone; acylphosphine oxides, suchas, aroylphosphine oxide, dibenzoylphenylphosphine oxide;benzophenone-based compounds, such as, benzophenone,2,4-dihydroxybenzophenone; andthioxanthone-based compounds, such as,thiopropoxythioxanthone, isopropylthioxanthone. For instance, thephotoinitiator can be one or more selected from the group consisting of2-hydroxy-2-methyl-1-phenylacetone,2-methyl-2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-1-acetone,2-hydroxy-2-methyl-1-phenylacetone, 1-hydroxycyclohexylphenylketone or2-hydroxy-2-methyl-1-phenylacetone.

In a further embodiment, the composition for overcoat layercan furthercomprise, based on the total weight of the composition for overcoatlayer:

-   -   1-20 wt % of epoxy group-containing acrylate resin;    -   1-20 wt % of curing agent;    -   70.5-83.5 wt % of organic solvent; and    -   0.01-2 wt % of an adjuvant.

In an aspect, the epoxy group-containing acrylate resin can comprise oneor more selected from the group consisting of methyl acrylate-modifiedepoxy resin, methyl methacrylate-modified epoxy resin, ethylacrylate-modified epoxy resin, ethyl methacrylate-modified epoxy resin,butyl acrylate-modified epoxy resin, butyl methacrylate-modified epoxyresin, acrylate copolymer-modified epoxy resin andmethacrylatecopolymer-modified epoxy resin. The curing agent cancomprise one or more selected from the group consisting of organicacids, anhydrides, aliphatic amines, acromatic amines, and amides, suchas, one or more selected from the group consisting of maleic anhydride,phthalic anhydride, trimellitic anhydride and polyamide resin. Theorganic solvent can comprise one or more selected from the groupconsisting of alcohols, esters, ketones, an ethers, such as, one or moreselected from the group consisting of propylene glycol monomethyl etheracetate and 3-ethyl ethoxypropionate.

In another aspect, the alkali-insoluble resin can comprise epoxy resinor polyurethane resin, such as, Epoxy Acrylic Resin 6118, PolyesterAcrylic Resin SK8924 or Polyurethane Acrylate SM6201 availabel fromSanmuchem, Inc., Jiangsu, P.R.C.

In yet another aspect, the additive and the adjuvant can be one or moreselected from the group consisting of adhesion promotors and levelingagents, respectively. For instance, the adhesion promoters can beγ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560, available fromMingyang Chem Inc., Shangdong, P.R.C.) orγ-methylacryloyloxypropyltrimethylsilane (KH-570, available fromMingyang Chem Inc., Shangdong, P.R.C.), and the leveling agent can beEFKA-3883 available from EFKA, Holand.

An embodiment of the present invention further provides a method ofproducing a composition for overcoat layer comprising:

-   -   mixing and dispersing 30-60 wt % of a photo-curable unsaturated        oligomer, 30-60 wt % of a photo-polymerizable monomer, 1-10 wt %        of a photoinitiator, and 0-5 wt % of an additive based on the        total weight of a capsule core to produce a composition for        capsule core;    -   adding the composition for capsule core dropwise into a resinous        material for forming a capsule wall to form a suspension of        microcapsules;    -   filtering the suspension of microcapsules, screening, drying and        curing, to produce microcapsules; and    -   mixing 1-10 wt % of microcapsules based on the total weight of        the composition for overcoat layer with other components of the        composition for overcoat layer to form the composition for        overcoat layer.

In an aspect, the other component of the composition for overcoat layercomprises 1-20 wt % of epoxy group-containing acrylate resin, 1-20 wt %of curing agent, 70.5-83.5 wt % of organic solvent and 0.01-2 wt % of anadjuvant based on the total weight of the composition for overcoatlayer.

In another aspect, mixing 1-10 wt % of microcapsules based on the totalweight of the composition for overcoat layer with other components ofthe composition for overcoat layer to foam the composition for overcoatlayer comprises:

-   -   mixing, based on the total weight of the capsule core, 30-60 wt        % of the photo-curable unsaturated oligomer, 30-60 wt % of the        photo-polymerizable monomer, 1-10 wt % of the photoinitiator,        and 0-5 wt % of the additive to form a mixture; and    -   dispersing the mixture under agitation at 300 to 1,000 rpm for 1        to 4 hours.

The embodiment of the present invention further provides a displayapparatus comprising a color filter substrate, wherein the compositionfor overcoat layer in accordance with the embodiment of the presentinvention or produced in accordance with the method of the embodiment ofthe present invention is used to form the overcoat layer of the colorfilter substrate. For instance, the display apparatus can be anyproducts or parts having a display function, e.g., liquid crystalpanels, electric papers, OLED panels, liquid crystal television, liquidcrystal display, digital frames, mobile phones, or tablet PC.

The following examples are provided to further illustrate thecomposition for overcoat layer of the present invention and the methodof producing the same. However, the present invention is not limited tothose examples.

I. Preparation of Composition for Capsule Core

Examples 1 to 5 produce compositions for capsule core. The compositionsof Examples 1 to 5 are prepared as follows: 30-60 wt % of photo-curableunsaturated oligomer, 30-60 wt % of photo-polymerizable monomer, 1-10 wt% of a photoinitiator, and 0-5 wt % of an additive are mixed together toform a mixture. The used materials and the amounts thereof are listed inTable 1 below.

The mixtures are dispersed under agitation at 600 rpm for 2 hrs toproduce the composition for capsule core. The agitation may be carriedout in a manner of mechanical agitation.

TABLE 1 Components and Weight Percents thereof of the Capsule Cores ofExamples 1 to 5 Components and Weight Percents Thereof of the CapsuleCore Example 1 Example 2 Example 3 Example 4 Example 5 Photo-curable 30wt % 39 wt % 47 wt % 50 wt % 60 wt % unsaturated epoxy acrylic polyesteracrylic epoxy acrylic epoxy acrylic polyurethane oligomer resin 6118resin SK8924 resin 6118 resin 6118 acrylate SM6201 Photo- 60 wt % DPHA30 wt % DPHA; 20 wt % DPHA; 30 wt % PETA; 30 wt % DPPA polymerizable 29wt % TMPTA 16 wt % PETA; 15 wt % TMPTA monomer 10 wt % TMPTAPhotoinitiator 10 wt % 1 wt % 5 wt % 2 wt % 5 wt % 2-hydroxy-2-2-methyl-2- 2-hydroxy-2- 1-hydroxy- 2-hydroxy-2- methyl-1- (4-morpholinmethyl-1- cyclohexyl- methyl-1- phenylacetone yl)-1-[4- phenylacetonephenylketone phenylacetone (1173) (methylthio)phenyl]- (1173) (184)(1173) 1-acetone (907) Additive 0 1 wt % KH-560 2 wt % KH-560 3 wt %KH-560 3 wt % KH-560; 2 wt % KH-570

II. Preparation of Microcapsules

Example 6 to 9 produce microcapsules. The capsule core compositionpreparated in accordance with Examples 1 to 5 are added dropwise into asolution of resin for forming a capsule wall, wherein the components andweight percents thereof of each solution of resin are shown in Tablebelow.

Phases separate due to the polar difference between the capsule core andthe capsule wall. Using mechanical stirring rates of 200 to 1000 rpm,respectively, suspensions of particles having different particlediameters are formed by dispersing the capsule core compositions intothe resin solutions. The resultant suspensions are filtered, screened,dried, and cured, thereby producing microcapsule particles havingdifferent particles diameters in the range of from 10 to 100 nm. Thespecific stirring rate and the resultant particle diameters are shown inTable 2.

TABLE 2 Components and Weight Percents of Microcapsules Components andWeight Percents of Microcapsules Example 6 Example 7 Example 8 Example 9Composition 5 wt % 10 wt % 15 wt % 20 wt % for capsule Capsule coreCapsule core Capsule core Capsule core core composition compositioncomposition composition produced in produced in produced in produced inExample 2 Example 3 Example 2 Example 3 Resin for 20 wt % 20 wt % 30 wt% 30 wt % forming the epoxy resin epoxy resin polyurethane polyurethanecapsule wall resin resin Solvent 75 wt % 70 wt % 55 wt % 50 wt % xylenexylene xylene xylene Process Parameters Rotation 400 rpm 600 rpm 600 rpm800 rpm Speed Particle  85 nm  60 nm  55 nm  35 nm Diameters ofMicrocapsules

III. Preparation of Composition for Overcoat Layer

Example 10 to 14 produce compositions for overcoat layer. 1-10 wt % ofmicrocapsules, 1-20 wt % of epoxy group-containing acrylate resin, 1-20wt % of curing agent, 70.5-83.5 wt % of organic solvent and 0.01-2 wt %of an adjuvant based on the total weight of the composition for overcoatlayer (as shown in Table 3) are mixed homogeneously to give the desiredcomposition for overcoat layer.

TABLE 3 Components and Weight Percents of Composition for Overcoat layerComponents and Weight Percents of composition for overcoat layer Example10 Example 11 Example 12 Example 13 Example 14 Epoxy group- 1 wt %methyl 5 wt % ethyl 10 wt % methyl 15 wt % methyl 20 wt % methylcontaining acrylate-modified acrylate-modified acrylate-modifiedmethacrylate-modified methacrylate-modified acrylate resin epoxy resinepoxy resin epoxy resin epoxy resin epoxy resin Curing agent 20 wt %maleic 1 wt % phthalic 6 wt % trimellitic 5 wt % polyamide 5 wt %polyamide anhydride anhydride anhydride resin-651 resin-651Microcapsules 1 wt % 10 wt % 2 wt % 5 wt % 2.5 wt % MicrocapsulesMicrocapsules Microcapsules Microcapsules Microcapsules prepared inprepared in prepared in prepared in prepared in accordance accordanceaccordance accordance accordance with Example 6 with Example 7 withExample 8 with Example 9 with Example 6 Organic 77.99 wt % 83.5 wt % 50wt % 50 wt % 70.5 wt % solvent propylene glycol propylene glycolpropylene glycol propylene glycol propylene glycol monomethyl monomethylmonomethyl monomethyl monomethyl ether acetate ether acetate etheracetate ether acetate ether acetate (PGMEA) (PGMEA) (PGMEA); (PGMEA);(PGMEA) 31 wt % 23.5 wt % 3-ethyl 3-ethyl ethoxypropionateethoxypropionate Adjuvant 0.01 wt % KH-560 0.5 wt % KH-560 0.5 wt %KH-560; 1.0 wt % KH-560; 1 wt % KH-570; 0.5 wt % EFKA-3883 0.5 wt %EFKA-3883 0.5 wt % KH-560; 0.5 wt % EFKA-3883

IV. Preparation of Overcoat Layer

Example 15 to 19 produce overcoat layers. The compositions for overcoatlayer prepared in accordance with Example 10 to 14 are applied to cleanglass substrates (370 mm*470 mm) on which BM and color photoresists havebeen applied. After drying under vacuum for 30 to 240 s, the substratesare baked at 200 to 250° C. in an oven for 20 to 50 min. Then, the bakedcoated glass substrates are cooled to room temperature, to give theovercoat layers of Examples 15 to 19. The specific process parametersare shown in Tables 4 and 5.

TABLE 4 Technical Conditions During Preparation of Overcoat LayersProcess Steps Parameters 1 2 3 Coating Thickness μm 1.5 2.0 2.0 Dryingunder Pressure Pa 20 30 40 vacuum Time s 40 30 25 Baking Temperature °C. 230 240 240 Time min 25 25 30

TABLE 5 Technical Conditions During Preparation of Overcoat Layers Usedin Example 15 to 19 Exam- Exam- Exam- Exam- Exam- ple 15 ple 16 ple 17ple 18 ple 19 Technical 1 2 2 3 3 Conditions

V. Test

For demonstrating the auto-repairing properties of the overcoat layer,the glass substrated coated with the overcoat layer was scratched, andobservated for the status of the layer at the damaging site, andcompared with a conventional overcoat layer.

The overcoat layers of Examples 15 to 19 are scratched to form 100damaged points having a size of 30 to 50 μm, respectively, and thenexposed to light radiation at 50 mJ/cm².

Overcoat layers having the same compositions as Example 18 and 19 exceptthat they do not contains microcapsules are prepared and used ascomparative examples 1 and 2. The overlayers of comparative examples 1and 2 are scratched to form 100 damaged points having a size of 30 to 50μm, respectively, and then exposed to light radation at 50 mJ/cm².

Before and after light radiation, the overcoat layers of Examples 15 to19 and Comparative Examples 1, 2 are tested by using Auto OpticalInspection (AOI) Instrument, recording the number of defects presentthereon. The results are shown in Table 6 below.

TABLE 6 Test Results of Auto-repairing Property of Overcoat LayersNumber of damaged points (30 to 50 μm) on Comparative ComparativeExample Example Example Example Example the overcoat layers Example 1Example 2 15 16 17 18 19 Before light 100 100 100 100 100 100 100radiation After light 100 100 11 9 10 8 9 radiation

It can be seen from the test that the overcoat layers will be damageddue to the presence of contaminated particles or scratch by externalforce. Such damages tend to be repaired via additional procedures,thereby increasing the complexity and cost of production technology.However, it can be seen from the results as shown in the above tablesthat the overcoat layers prepared by using the composition for overcoatlayer of the embodiments of the present invention can reducesubstantially such damages due to their auto-repairing property, e.g.,the defect ratio thereof is around 10% of the defect ratio of the priorart overcoat layers. It is because a shear force caused by damage breaksthe capsule wall, so that the capsule core composition flows out andfills the damaged positions. After light radiation, the auto-repairingof damage can be achieved, thereby reducing the complexity of technologyand the cost of production, and improving substantially the pass ratioand quality of TFT-LCD products.

It is apparent that persons skilled in the art can make variousmodification and variation of the present invention without departingthe spirit and scope of the present invention. Thus, provided that suchmodification and variation of the present invention fall within thescope of the appended claims and their equivalences, they are intendedto be encompassed within the present invention.

1. A composition for overcoat layer comprising, based on the totalweight of the composition for overcoat layer: 1-10 wt % of microcapsuleshaving a capsule wall and a capsule core, wherein the capsule wallcomprises an alkali-insoluble resin, and the capsule core comprises,based on the weight of the capsule core, 30-60 wt % of a photo-curableunsaturated oligomer; 30-60 wt % of a photo-polymerizable monomer; 1-10wt % of a photoinitiator; and 0-5 wt % of an additive.
 2. Thecomposition for overcoat layer of claim 1, wherein: the photo-curableunsaturated oligomer comprises one or more selected from the groupconsisting of epoxy acrylic resin, polyester acrylic resin, andpolyurethane acrylate, the photo-polymerizable monomer comprises one ormore selected from the group consisting of dipentaerythritolhexacrylate. trimethylolpropane triacrylate, pentaerythritoltetracrylate, and dipentaerythritol pentacrylate; and the photoinitiatorcomprises one or more selected from the group consisting of benzoin,benzoin dimethylether, deoxybenzoin, α-hydroxyalkylphenone, aroylphosphine oxide, dibenzoylphenylphosphine oxide, benzophenone,2,4-dihydroxybenzophenone, thiopropoxythioxanthone andisopropylthioxanthone.
 3. The composition for overcoat layer of claim 1,further comprising, based on the total weight of the composition: 1-20wt % of epoxy group-containing acrylate resin; 1-20 wt % of a curingagent; 70.5-83.5 wt % of an organic solvent; and 0.01-2 wt % of anadjuvant.
 4. The composition for overcoat layer of claim 3, wherein: theepoxy group-containing acrylate resin comprises one or more selectedfrom the group consisting of methyl acrylate-modified epoxy resin,methyl methacrylate-modified epoxy resin, ethyl acrylate-modified epoxyresin, ethyl methacrylate-modified epoxy resin, butyl acrylate-modifiedepoxy resin, butyl methacrylate-modified epoxy resin, acrylatecopolymer-modified epoxy resin and methacrylatecopolymer-modified epoxyresin; the curing agent comprises one or more selected from the groupconsisting of maleic anhydride, phthalic anhydride, trimelliticanhydride and polyamide resin; and the organic solvent comprises one ormore selected from the group consisting of propylene glycol monomethylether acetate and 3-ethyl ethoxypropionate.
 5. The composition forovercoat layer of claim 1, wherein the alkali-insoluble resin comprisesepoxy resin or polyurethane resin.
 6. The composition for overcoat layerof claim 3, wherein the additive and the adjuvant are one or moreselected from the group consisting of adhesion promotor and levelingagent, respectively.
 7. A method of producing the composition forovercoat layer of claim 1, comprising: mixing and dispersing, based onthe total weight of the capsule core, 30-60 wt % of the photo-curableunsaturated oligomer, 30-60 wt % of the photo-polymerizable monomer,1-10 wt % of the photoinitiator, and 0-5 wt % of the additive to producea composition for capsule core; adding the composition for capsule coredropwise into a solution of the resin for forming capsule wall andstirring to form a suspension of microcapsule; filtering the suspensionof microcapsule, screening, drying, and curing, to producemicrocapsules; and mixing 1-10 wt % of microcapsules based on the totalweight of the composition for overcoat layer with other components ofthe composition for overcoat layer to for the composition for overcoatlayer.
 8. The method of producing the composition for overcoat layer ofclaim 7, wherein the other components of the composition for overcoatlayer comprises 1-20 wt % epoxy group-containing acrylate resin, 1-20 wt% of curing agent, 70.5-83.5 wt % of organic solvent, and 0.01-2 wt % ofadjuvants, based on the total weight of the composition for overcoatlayer.
 9. The method of producing the composition for overcoat layer ofclaim 7, wherein the mixing and dispersing, based on the total weight ofthe capsule core, 30-60 wt % of the photo-curable unsaturated oligomer,30-60 wt % of the photo-polymerizable monomer, 1-10 wt % of thephotoinitiator, and 0-5 wt % of the additive to produce a compositionfor capsule core comprises: mixing, based on the total weight of thecapsule core, 30-60 wt % of the photo-curable unsaturated oligomer,30-60 wt % of the photo-polymerizable monomer, 1-10 wt % of thephotoinitiator, and 0-5 wt % of the additive to form a mixture; anddispersing the mixture under agitation at 300 to 1,000 rpm for 1 to 4hours,
 10. A display apparatus comprising a color filter substrate,wherein the composition for overcoat layer of claim 1 is used to formthe overcoat layer of the color filter substrate.
 11. The method ofproducing the composition for overcoat layer of claim 7, wherein: thephoto-curable unsaturated oligomer comprises one or more selected fromthe group consisting of epoxy acrylic resin, polyester acrylic resin,and polyurethane acrylate. the photo-polymerizable monomer comprises oneor more selected from the group consisting of dipentaerythritolhexacrylate, trimethylolpropane triacrylate, pentaerythritoltetracrylate, and dipentaerythritol pentacrylate; and the photoinitiatorcomprises one or more selected from the group consisting of benzoin,benzoin dimethylether, deoxybenzoin, α-hydroxyalkylphenone, aroylphosphine oxide, dibenzoylphenylphosphine oxide, benzophenone,2,4-dihydroxybenzophenone, thiopropoxythioxanthone andisopropylthioxanthone, wherein
 12. The method of producing thecomposition for overcoat layer of claim 8, wherein: the epoxygroup-containing acrylate resin comprises one or more selected from thegroup consisting of methyl acrylate-modified epoxy resin, methylmethacrylate modified epoxy resin, ethyl acrylate-modified epoxy resin,ethyl methacrylate-modified epoxy resin, butyl acrylate-modified epoxyresin, butyl methacrylate-modified epoxy resin, acrylatecopolymer-modified epoxy resin and methacrylatecopolymer-modified epoxyresin; the curing agent comprises one or more selected from the groupconsisting of maleic anhydride, phthalic anhydride, trimelliticanhydride and polyamide resin; and the organic solvent comprises one ormore selected from the group consisting of propylene glycol monomethylether acetate and 3-ethyl ethoxypropionate.
 13. The method of producingthe composition for overcoat layer of claim 7, wherein thealkali-insoluble resin comprises epoxy resin or polyurethane resin. 14.The composition for overcoat layer of claim 8, wherein the additive andthe adjuvant are one or more selected from the group consisting ofadhesion promotor and leveling agent, respectively.
 15. The displayapparatus of claim 10, wherein the the composition for overcoat layerfurther comprises: 1-20 wt % of epoxy group-containing acrylate resin;1-20 wt % of a curing agent; 70.5-83.5 wt % of an organic solvent; and0.01-2 wt % of an adjuvant
 16. The display apparatus of claim 15,wherein the additive and the adjuvant are one or more selected from thegroup consisting of adhesion promotor and leveling agent, respectively.17. A display apparatus comprising a color filter substrate, wherein thecomposition for overcoat layer produced in accordance with the method ofclam 7 is used to form the overcoat layer of the color filter substrate.18. The display apparatus of claim 17, wherein the the composition forovercoat layer further comprises: 120 wt % of epoxy group-containingacrylate resin; 1-20 wt % of a curing agent; 70.5-83.5 wt % of anorganic solvent; and 0.01-2 wt % of an adjuvant.
 19. The displayapparatus of claim 18, wherein the additive and the adjuvant are one ormore selected from the group consisting of adhesion promotor andleveling agent, respectively.
 20. The display apparatus of claim claim17, wherein the mixing and dispersing, based on the total weight of thecapsule core, 30-60 wt % of the photo-curable unsaturated oligomer,30-60 wt % of the photo-polymerizable monomer, 1-10 wt % of thephotoinitiator, and 0-5 wt % of the additive to produce a compositionfor capsule core comprises: mixing, based on the total weight of thecapsule core, 30-60 wt % of the photo-curable unsaturated oligomer,30-60 wt % of the photo-polymerizable monomer, 1-10 wt % of thephotoinitiator, and 0-5 wt % of the additive to form a mixture; anddispersing the mixture under agitation at 300 to 1,000 rpm for 1 to 4hours.